Check the baby well, and wash the bird with dawn dish soap and rinse well.
Pat dry, You will need a syringe and some Kaytee exact baby bird formula.
As Gary has said if there are any open wounds best to treat with Baytril.
& apply neosporin to any open wounds.
Depending on the age will determine the feedings.....
Try the foster thing with the doves, but only after to are completely sure the babies is with NO wounds and washed and rinsed thoughly...
I use a medium syringe, mix the Kaytee with warm water and very runny, fill the syringe half way, hold upright tap on the side to remove all air, press on plunger to remove the air, then place the syringe into the back of the mouth past the vents and fill the crop with one plunge...
3 times per day, assure the crop is empty before the next feeding...using your hands feel the breast, if empty you will feel nothing...
Here's a picture of my syringes...the smaller one is used for real small babies, very young...

You can get these at petshops
Have to go to work.
Good luck